All vulnerabilities

Servers and applications

CVE-2026-11856

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.

Severity
Critical 9.8
Published
3 Jul 2026
Last changed
15 Sept 2026
Added to UpHeron
21 Oct 2026
Fixed in
8.21.0
Sources
NVD

Affected software

SoftwareAffected versions
curlServers and applications · cpe:a:haxx:curl
  • From 7.10.6 before 8.21.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-11856
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-11856